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I bought a cheap 4mm Plossl from Andrews Communication years ago.
The eye-relief was terrible - I couldn't see the entire field......that was a useless purchase I thought.
But then I had a bright idea - I pulled off the rubber that ran around the top of the eyepiece, and then I could see the entire field, and the eyepiece was actually pretty good - and I bought two more.
My understanding of the "less glass" thing from something I read decades ago, is that it's a hangover from before WW11, when multicoatings on glass surfaces were generally unavailable. Less glass gave the best images back then, but that ceased to be the case afterwards when more glass could be used.
Regards,
Renato
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